Harold Ford Mayfield (25 March 1911 – 27 January 2007) was an American business executive and amateur ornithologist who made a major study of Kirtland's warbler and worked for the preservation of their breeding areas.
During his study of the warbler, he introduced a standardized measure of nesting success based on his professional experience in industry and from his training in mathematics.
Due to the social stigma of the time he was given away for adoption and raised by Frank and Mae Ford Mayfield in Iowa.
He served as an advisor to the Kennedy and Johnson administrations as a member of the council on economic opportunity and won a distinguished service award in 1965 from the American Association of Industrial Management.
He also worked on efforts to preserve, manage and monitor the habitats in the breeding areas of Kirtland's warbler.